I'm in agreement with Inspector Callahan. I kind of think S&W would routinely pull a 629 full-lugged barrel off the line and do a QC check. If it passed the DX accuracy test, they lasered the barrel 625 Classic DX. You then got all the extra front sights along with two pairs of grips with the test target. I have a 629-4 Classic that I'll put up against any DX. That gun shoots my handloaded 240gr. XTP's into very small groups. Back in the 90's, I had a family member in the gun biz. I was able to check out a lot of new Smith's. This one 6.5" Classic simply locked up like a bank vault, and I bagged it. My targets bore out this was a very good purchase for under $400. That's right folks...........about 15 years ago a dollar had some purchasing power............these days............well that's another story for another forum altogether.